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Event Control Block (ECB)
z/OS DFSMSdfp Advanced Services
The event control block (ECB) provides you with a completion code that describes whether the channel program was completed with or without error. A WAIT or EVENTS macro instruction, which can be used to synchronize I/O operations with the problem program, must identify the ECB. You must define the ECB and specify its address in the IOB. See Event Control Block (ECB) Fields.
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